Method and device for handling radio link failure

Abstract

The invention relates to a method and a device for handling radio link failure. In accordance with an embodiment of the present disclosure, a method includes receiving a Radio Link Failure (RLF) report for a first sidelink communication between a first User Equipment (UE) and a second UE; and releasing the sidelink radio resource configuration or transmitting information indicating the release of the radio resource configuration.

Description

[0001] Divisional application information

[0002] This application is a divisional application of the invention patent application filed on January 16, 2019, with application number "201980087055.1" and invention title "Method and apparatus for handling radio link failure". Technical Field

[0003] This application generally relates to wireless communication systems, and more specifically, to methods and apparatus for handling radio link failures in wireless communication systems. Background Technology

[0004] In a wireless communication system, a user equipment (or UE, such as a mobile device) can communicate with another UE via a data path through an operator's network. The network's data path may include base stations (or BSs) and gateways.

[0005] If a UE is relatively close to another UE, a radio link or side link can be established to provide device-to-device (or D2D) communication without the need for a direct link to the BS. In contrast to the communication via cellular infrastructure (uplink and downlink) discussed above, the term "side link" refers to a direct radio link used for communication between devices. A side link is also known as a D2D link. D2D communication can be used in any suitable telecommunications network according to various standards. The network can be configured with a resource pool that can perform D2D operations on the UE.

[0006] D2D operation offers various advantages, such as relatively high transmission rates and relatively low latency. Furthermore, in D2D operation, services centralized on the base station can be allocated. Additionally, D2D UEs can be used as repeaters to extend the coverage of base stations.

[0007] D2D communication incorporates vehicle-to-everything (or V2X) communication into the LTE sidelink. V2X communication covers communication involving vehicles as either a source or destination of messages. In New Radio (NR) communication systems, unicast and multicast are introduced into V2X communication. Access layer (AS) connections can be established to enable unicast or multicast on the sidelink.

[0008] Radio links or sidelinks can fail due to various factors, such as (but not limited to) building obstructions, relatively long distances between UEs, obstruction by moving objects (e.g., vehicles), vegetation (due to seasonal changes), etc. Although Radio Resource Management (RRM) and Radio Link Monitoring (RLM) have been developed based on AS-level link management to maintain sidelinks, RRM and RLM may not be sufficient to address the aforementioned issues. Therefore, a mechanism is needed to report and handle Radio Link Failures (RLFs) on the sidelink. Summary of the Invention

[0009] According to some embodiments of this application, a method includes: receiving a report of a radio link failure (RLF) in a first sidelink communication between a first user equipment (UE) and a second UE; and releasing the sidelink radio resource configuration.

[0010] According to some embodiments of this application, a method includes: receiving a report of a radio link failure (RLF) in a first sidelink communication between a first user equipment (UE) and a second UE; and transmitting information indicating the release of radio resource configuration.

[0011] According to some embodiments of this application, a method includes: detecting an RLF (Recurrent Link Fault) in a first sidelink communication between a first UE and a second UE; and transmitting an RLF report.

[0012] According to some embodiments of this application, a method includes: detecting the RLF of a first sidelink communication between a first UE and a second UE; and releasing the sidelink radio resource configuration.

[0013] According to some embodiments of this application, an apparatus includes at least one non-transitory computer-readable medium storing computer-executable instructions therein. The apparatus further includes at least one receiver. The apparatus further includes at least one transmitter. The apparatus further includes at least one processor. The processor is coupled to the at least one non-transitory computer-readable medium, the at least one receiver, and the at least one transmitter. The at least one non-transitory computer-readable medium and the computer-executable instructions are configured to use the at least one processor to cause the apparatus to perform the described method. Attached Figure Description

[0014] To illustrate how the advantages and features of this disclosure can be obtained, the description of this disclosure is presented with reference to specific embodiments of the disclosure illustrated in the accompanying drawings. These drawings depict only exemplary embodiments of the disclosure and should therefore not be considered as limiting its scope.

[0015] Figure 1 This application describes a wireless communication system according to some embodiments of the present application;

[0016] Figure 2 This application describes another wireless communication system according to some embodiments of the present application;

[0017] Figure 3 This application describes the side link connection according to some embodiments of the present application;

[0018] Figure 4 This application describes a method for handling radio link failures according to some embodiments of the present application;

[0019] Figure 5 This application describes another method for handling radio link failures according to some embodiments of the present application;

[0020] Figure 6 This application describes another method for handling radio link failures according to some embodiments of the present application;

[0021] Figure 7 This application describes signaling associated with interactions involving side-link communication in a wireless communication system according to some embodiments of the present application;

[0022] Figure 8 This describes signaling associated with interactions involving side-link communication in a wireless communication system according to some other embodiments of this application;

[0023] Figure 9 This application describes signaling associated with interactions involving side-link communication in a wireless communication system according to some other embodiments of the present application; and

[0024] Figure 10 This application describes an apparatus for handling radio link failures according to some embodiments of the present application. Detailed Implementation

[0025] The detailed description of the accompanying drawings is intended to illustrate preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure may be practiced. It should be understood that the same or equivalent functionality may be accomplished through different embodiments that are intended to be covered within the spirit and scope of the present disclosure.

[0026] Figure 1 This application describes a wireless communication system 1 according to some embodiments of the present application.

[0027] refer to Figure 1 The wireless communication system 1 includes a base station (BS), user equipment (UE) 1, user equipment (UE) 2, user equipment (UE) 3, user equipment (UE) 4, user equipment (UE) 5, user equipment (UE) 6, and user equipment (UE) 7. Although for simplicity... Figure 1Only one base station is described in this application, but it is considered that in some other embodiments of this application, the wireless communication system 1 may include more base stations. Although for simplicity... Figure 1 Only UE 1, UE 2, UE 3, UE 4, UE 5, UE 6 and UE 7 are described in this application, but in some other embodiments of this application, the wireless communication system 1 may include more or fewer UEs.

[0028] The BS may operate, for example (but not limited to), based on standard protocols such as Long Term Evolution (LTE), Advanced LTE (LTE-A), New Radio (NR), or other suitable protocols.

[0029] UE 1 may include, for example (but not limited to), computing devices, wearable devices, mobile devices, IoT devices, vehicles with at least one transceiver, etc. Each of UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 may include devices identical or similar to UE 1. Each of UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 may include devices different from UE 1. Those skilled in the art will understand that the terminology described in this disclosure may change as technology develops and advances, and this should not affect or limit the principles and spirit of this disclosure. Each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 is within the coverage of BS.

[0030] The BS can schedule resources for each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6 and UE 7 to perform data transmission and information control during direct D2D or sidelink communication.

[0031] Each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6 and UE 7 can select resources from the resource pool used for D2D or sidelink communication during direct data transmission and direct information control.

[0032] Figure 2 This application describes a wireless communication system 2 according to some embodiments of the present application.

[0033] refer to Figure 2 The wireless communication system 2 includes User Equipment 1, User Equipment 2, User Equipment 3, User Equipment 4, User Equipment 5, User Equipment 6, and User Equipment 7. Although for simplicity... Figure 2 Only UE 1, UE 2, UE 3, UE 4, UE 5, UE 6 and UE 7 are described in this application, but in some other embodiments of this application, the wireless communication system 2 may include more or fewer UEs.

[0034] UE 1 may include, for example (but not limited to), computing devices, wearable devices, mobile devices, IoT devices, vehicles with at least one transceiver, etc. Each of UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 may include devices identical or similar to UE 1. Each of UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 may include devices different from UE 1. Those skilled in the art will understand that the terminology described in this disclosure may change as technology develops and advances, and this should not affect or limit the principles and spirit of this disclosure. Each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 is outside the coverage area of ​​the BS. Wireless communication system 2 is outside the coverage area of ​​the BS.

[0035] Because UE 1, UE 2, UE 3, UE 4, UE 5, UE 6 and UE 7 are outside the coverage area of ​​the BS, the BS cannot schedule resources for each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6 and UE 7 to perform sidelink communication.

[0036] Each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6 and UE 7 can select resources from the resource pool used for D2D or sidelink communication.

[0037] Figure 3 This application describes the side link connection according to some embodiments of the present application.

[0038] refer to Figure 3 Establish a sidelink connection between UE1 and UE2, such as... Figure 1 or Figure 2 The diagram shows that side link connection 3 includes carriers C1, C2, C3, C4, and C5. Although for simplicity... Figure 3 Only carriers C1, C2, C3, C4, and C5 are described in this application, but in some other embodiments of this application, the side link connection 3 may include more or fewer carriers. In other words, carriers C1, C2, C3, C4, and C5 are used in the side link connection 3 between UE 1 and UE 2.

[0039] In NR V2X, a service-to-carrier mapping exists on the sidelink, meaning that a V2X service can be mapped to one or more carriers, and a carrier can be mapped to one or more V2X services. Services between UEs may include radio bearer-related configurations. V2X services between UEs may further include Quality of Service (QoS)-related configurations. V2X services between UEs may further include radio resource-related configurations. V2X services between UEs may include at least one or a combination of radio bearer-related configurations, QoS-related configurations, or radio resource-related configurations. The type of V2X service is not limited to these and can be selected according to actual needs.

[0040] For example, service 31 can be mapped to carriers C1, C2, and C3 on sidelink connection 3. In other words, carriers C1, C2, and C3 are configured for service 31. Carrier C4 is configured for service 32. Carrier C5 is configured for services 33 and 34.

[0041] Figure 4 Method 4 describes a method for handling radio link failures (or RLF) according to some embodiments of this application. Method 4 can be used to handle situations such as... Figure 1 The RLF in wireless communication 1 is shown in the figure.

[0042] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (Side link connection 3 shown in the diagram). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to the BS. Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2. Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to the upper layer of UE 2. Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to the upper layer of UE 1.

[0043] If a sidelink connection carrier between UE1 and UE2 fails, UE1 can determine, declare, or detect an RLF. For example, UE1 can determine, declare, or detect an RLF after receiving an expiration message on the sidelink connection carrier between UE1 and UE2. The expiration message can be generated by a timer in a lower layer of UE1 (e.g., the physical layer or other suitable layer). For example, in the physical layer of UE1, a timer is started after receiving a "dissynchronization" indication on the sidelink carrier. If the number of consecutive "dissynchronization" indications reaches or exceeds a predetermined value (or threshold), the sidelink carrier is determined, declared, or detected as having failed. If a "synchronization" indication on the sidelink carrier is received before the number of consecutive "synchronization" indications reaches or exceeds the threshold, the timer is stopped.

[0044] RLF can be determined, declared, or detected by UE 1 based on the carrier retransmission amount of the sidelink connection between UE 1 and UE 2. For example, if the retransmission amount of the sidelink carrier reaches or exceeds a predetermined value (or threshold), then the sidelink carrier is determined, declared, or detected as having a fault.

[0045] Return to reference Figure 3 The RLF report may include the sidelink connection identifier (ID) for sidelink communication; for example, sidelink connection 3 may have an ID. The RLF report may include the UE's ID, such as the ID of UE 1. The RLF report may include the UE's ID, such as the ID of UE 2. The report may include the carrier index, for example... Figure 3 The carrier index of each of C1, C2, C3, C4, or C5 shown in the report. The RLF report may contain V2X service IDs, such as the V2X service IDs of each of services 31, 32, 33, and 34.

[0046] The RLF report may also include at least one of the following: sidelink connection identifier (ID) for sidelink communication, transmitter UE ID, receiver UE ID, carrier index, V2X service ID, or other parameters.

[0047] If all carriers in a sidelink connection fail, a Recurrent LRF (RLF) can be determined, declared, or detected by UE 1. For example, if all carriers C1 through C5 with the same sidelink connection ID in sidelink connection 3 fail, an RLF is determined or declared. The RLF report may contain information indicating that all carriers C1 through C5 with the same sidelink connection ID have failed.

[0048] If all carriers used for service on sidelink connection 3 fail, then an RLF can be determined, declared, or detected by UE 1. For example, if carriers C1 through C3 (which have the same V2X service ID for service 31) fail, then an RLF is determined, declared, or detected. For example, if carrier C4 (which has the same V2X service ID for service 32) fails, then an RLF is determined, declared, or detected. For example, if carrier C5 (which has two different V2X service IDs for services 33 and 34 respectively) fails, then an RLF is determined, declared, or detected. In other words, if service on the sidelink connection fails, then an RLF is determined, declared, or detected.

[0049] RLF reports may contain information indicating a service (e.g., service 31) failure. In this case, carriers C1, C2, and C3 have failed, but carriers C4 and C5 remain functional. BS, UE 1, or UE 2 may reconfigure the resource pool or reschedule data to carriers C4, C5, or both for service 31.

[0050] In some embodiments of this disclosure, the RLF (Relational Link Default) for sidelink communication is determined by the receiver UE after a failure occurs in one of the multiple carriers having a sidelink connection ID for sidelink communication. The RLF report may include information indicating that a failure has occurred in one of the multiple carriers having a sidelink connection ID for sidelink communication.

[0051] In some embodiments of this disclosure, a V2X UE may have sidelink connections with different UEs. For example, such as Figure 1 or Figure 2 As shown, at the same time, UE 1 has a unicast connection with UE 2, UE 1 has a unicast connection with UE 6, and UE 2 has a unicast connection with UE 6. The RLF (Restricted Link Default) of the unicast connection between UE 1 and UE 2 will not affect the unicast connection between UE 1 and UE 6, or the unicast connection between UE 2 and UE 6. Similarly, the RLF of the unicast connection between UE 1 and UE 6 will not affect the unicast connection between UE 1 and UE 2, or the unicast connection between UE 2 and UE 6. The RLF of the unicast connection between UE 2 and UE 3 will not affect the unicast connection between UE 1 and UE 6, or the unicast connection between UE 1 and UE 2. In other words, the RLF of a unicast connection between any two UEs will not affect any other unicast connection between UEs. Sidelink connections between UEs are not limited to... Figure 1 or Figure 2 In other embodiments of this disclosure, one of a plurality of sidelink connections may be established between any UE and other UEs.

[0052] refer to Figure 4 In operation 401, the BS receives an RLF report from UE 1.

[0053] In Operation 402, the BS can release the sidelink radio resource configuration to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0054] Alternatively, in operation 403, the BS may transmit information indicating the release of sidelink radio resource configuration to UE2. Upon receiving the information indicating the release of sidelink radio resource configuration, UE2 may release the sidelink radio resource configuration to establish another sidelink connection or a new sidelink connection between UE1 and UE2.

[0055] In some embodiments of this disclosure, the sidelink radio resource configuration may include a radio configuration. The sidelink radio resource configuration may further include a unicast connection. The sidelink radio resource configuration may include at least one of a radio configuration or a unicast connection.

[0056] Figure 5 This application describes another method for handling radio link failures according to some embodiments of the present application. Method 5 can be used to handle situations such as... Figure 1 The wireless communication 1 shown in the example demonstrates RLF. Method 5 can be used to handle situations such as... Figure 2 The RLF in wireless communication 2 is shown in the image.

[0057] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0058] refer to Figure 5 In Operation 501, UE 2 receives an RLF report.

[0059] If it is determined in Operation 502 that UE 2 is within the coverage area of ​​the BS, such as Figure 1 As shown in the example, UE 2 can release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0060] Alternatively, if it is determined in operation 502 that UE 2 is within the coverage area of ​​the BS, then UE 2 may transmit an RLF report to the BS in operation 504. The BS may transmit or send information indicating the release of the sidelink radio resource configuration to UE 2. After receiving the information indicating the release of the sidelink radio resource configuration from the BS in operation 505, UE 2 may release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0061] Alternatively, if it is determined in operation 502 that UE 2 is within the coverage area of ​​the BS, then UE 2 may transmit an RLF report to the upper layer residing therein in operation 503. Upon receiving the RLF report, the upper layer of UE 2 may release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0062] The UE may include an upper layer. The upper layer is defined to distinguish it from the AS layer and the UE's lower layer. The upper layer may include a Non-Access Stratum (NAS) layer. The upper layer may include a V2X layer. The upper layer may include an application layer. The upper layer may include at least one of the NAS layer, V2X layer, or application layer. When the upper layer of UE 1 receives an RLF report, it may indicate the release of sidelink radio resource configuration. When the upper layer of UE 2 receives an RLF report, it may indicate the release of sidelink radio resource configuration.

[0063] In other words, regardless of whether UE 1 and UE 2 are within the coverage area of ​​the BS (e.g., in...), Figure 1 (in China) or outside the coverage area of ​​the BS (e.g., in...) Figure 2 In the middle layer, the upper layer can instruct to change the serving carrier or release the unicast connection after receiving the RLF report in order to establish another side link connection or a new side link connection between UE 1 and UE 2.

[0064] Return to reference Figure 2 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0065] refer to Figure 5 In Operation 501, UE 2 receives an RLF report.

[0066] If it is determined in Operation 502 that UE 2 is outside the coverage area of ​​the BS, such as Figure 2As shown in the example, UE 2 can release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0067] Alternatively, if it is determined in operation 502 that UE 2 is outside the coverage area of ​​the BS, then UE 2 may transmit an RLF report to the upper layer residing therein in operation 503. Upon receiving the RLF report, the upper layer of UE 2 may release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0068] Figure 6 This application describes another method for handling radio link failures according to some embodiments of the present application. Method 6 can be used to handle situations such as... Figure 1 The wireless communication 1 shown in the example illustrates RLF. Method 6 can be used to handle situations such as... Figure 2 The RLF in wireless communication 2 is shown in the image.

[0069] Return to reference Figure 2 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0070] refer to Figure 6 In operation 601, UE 1 detects the RLF of the sidelink connection between UE 1 and UE 2.

[0071] If it is determined in Operation 602 that UE 1 is outside the coverage area of ​​the BS, such as Figure 2 As shown in the diagram, UE 1 can transmit an RLF report to the upper layer residing therein in operation 604. After receiving the RLF report, the upper layer of UE 1 can release the sidelink radio resource configuration in operation 605 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0072] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0073] refer to Figure 6 In operation 601, UE 1 detects the RLF of the sidelink connection between UE 1 and UE 2.

[0074] If it is determined in Operation 602 that UE 1 is within the coverage area of ​​the BS, such as Figure 2 As shown in the diagram, UE 1 can transmit an RLF report to the upper layer residing therein in operation 604. After receiving the RLF report, the upper layer of UE 1 can release the sidelink radio resource configuration in operation 605 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0075] Alternatively, if it is determined in operation 602 that UE 1 is within the coverage area of ​​the BS, such as Figure 1 As shown in the diagram, UE 1 can transmit an RLF report to UE 2 or BS in Operation 603. Upon receiving the RLF report, UE 2 or BS can release the sidelink radio resource configuration to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0076] Figure 7 This application describes signaling associated with interactions involving side-link communication in a wireless communication system, according to some embodiments of the present application. These interactions can be used to handle, for example... Figure 2 The RLF in wireless communication 2 is shown in the image.

[0077] Return to reference Figure 2 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 The side link connection shown in Figure 3).

[0078] Once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 701, UE1 can transmit or send an RLF report to UE2 in operation 702. Because in Figure 2 If UE 1 and UE 2 are determined to be outside the coverage area of ​​the BS, then UE 2 can release the sidelink radio resource configuration in operation 703 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0079] Alternatively, once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 701, UE1 can transmit or send an RLF report to the upper layer residing therein in operation 702. Because in Figure 2If UE 1 and UE 2 are determined to be outside the coverage area of ​​the BS, then the upper layer of UE 1 or UE 2 can release the sidelink radio resource configuration in operation 703 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0080] Figure 8 This describes signaling associated with interactions involving side-link communication in a wireless communication system according to some other embodiments of this application. The interactions can be used to handle, for example... Figure 1 The RLF in wireless communication 1 is shown in the figure.

[0081] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 The side link connection shown in Figure 3).

[0082] Once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to UE2 in operation 802, and UE2 can transmit or send an RLF report to the BS in operation 803. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may release the sidelink radio resource configuration in operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0083] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to the BS in operation 804. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may release the sidelink radio resource configuration in operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0084] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to the BS in operation 804. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may instruct UE 2 to release the sidelink radio resource configuration in Operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0085] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to UE2 in operation 802, and UE2 can transmit or send an RLF report to the BS in operation 803. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may instruct UE 2 to release the sidelink radio resource configuration in Operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0086] Figure 9 This describes signaling associated with interactions involving side-link communication in a wireless communication system according to some other embodiments of this application. The interactions can be used to handle, for example... Figure 1 The RLF in wireless communication 1 is shown in the figure.

[0087] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 The side link connection shown in Figure 3).

[0088] Once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 901, UE1 can transmit or send an RLF report to UE2 in operation 902, and UE2 can transmit or send an RLF report to the BS in operation 903. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, UE 2 can release the sidelink radio resource configuration in Operation 905 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0089] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 901, UE1 can transmit or send an RLF report to the BS in operation 904. Figure 1 If UE 1 and UE 2 are within the coverage area of ​​the BS, UE 2 can release the sidelink radio resource configuration in Operation 905 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0090] Alternatively, once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 901, UE1 can transmit or send an RLF report to the upper layer residing therein in operation 902. Although in Figure 1It is determined that UE1 and UE2 are within the coverage area of ​​the BS, but the upper layer of UE1 or UE2 may release the sidelink radio resource configuration in Operation 905 to establish another sidelink connection or a new sidelink connection between UE1 and UE2.

[0091] Figure 10 This application describes an apparatus for handling radio link failures according to some embodiments of the present application.

[0092] like Figure 10 As shown, device 100 may include non-transitory computer-readable medium 101. Device 100 may further include receiver 102. Device 100 may further include transmitter 103. Device 100 may further include processor 104. Non-transitory computer-readable medium 101 stores computer-executable instructions. Processor 104 is configured to be coupled to non-transitory computer-readable medium 101. Processor 104 is configured to be coupled to receiver 102. Processor 103 is configured to be coupled to transmitter 103. In some other embodiments of this application, device 100 may include more computer-readable medium, receiver, transmitter, and processor as needed. In some embodiments, device 100 may be a BS. The BS may operate (e.g., but not limited to) a standard protocol based on LTE, LTE-A, NR, or other suitable protocols. In some embodiments, device 100 may be a UE. The UE may include, for example (but not limited to), a computing device, wearable device, mobile device, IoT device, vehicle with at least one transceiver, etc. In some embodiments, receiver 102 and transmitter 103 are integrated into a single device, such as a transceiver. In certain embodiments, device 100 may further include input devices, memory, and / or other components.

[0093] In some embodiments, a non-transitory computer-readable medium may store computer-executable instructions thereon that cause a processor to perform the methods of the BS described above. For example, the non-transitory computer-readable medium 101 and the computer-executable instructions are configured to use processor 104 to cause device 100 to perform the methods of the BS described above. Figures 4 to 9 The operation of BS is described in the text.

[0094] In some embodiments, a non-transitory computer-readable medium may store computer-executable instructions thereon that cause a processor to perform a method relating to UE 1, assuming it is used as a receiver UE, as described above. For example, the non-transitory computer-readable medium 101 and the computer-executable instructions are configured to use processor 104 to cause device 100 to perform a method relating to UE 100. Figures 4 to 9 The operation of UE 1 is described in the text.

[0095] In some embodiments, a non-transitory computer-readable medium may store computer-executable instructions thereon that cause a processor to perform a method relating to UE2, assuming it is used as transmitter UE2, as described above. For example, the non-transitory computer-readable medium 101 and the computer-executable instructions are configured to use processor 104 to cause device 100 to perform a method relating to UE2. Figures 4 to 9 The operation of UE 2 is described in the text.

[0096] In some embodiments, the device may include a PC5 interface. The RLM / RLF method described in this disclosure is applicable to PC5 interfaces between devices, and the devices are not limited thereto. The device may be a vehicle. Those skilled in the art will understand that the terminology described in this disclosure may change as technology develops and advances, and this should not affect or limit the principles and spirit of this disclosure.

[0097] Those skilled in the art will understand that the steps of the methods described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. Furthermore, in some aspects, the steps of the method may reside as one or any combination or set of code and / or instructions on a non-transitory computer-readable medium that can be incorporated into a computer program product.

[0098] Although this disclosure has been described with reference to specific embodiments thereof, it will be apparent to those skilled in the art that many alternatives, modifications, and variations will be readily apparent. For example, various components of the embodiments may be interchanged, added, or substituted in other embodiments. Moreover, not all elements of each figure are essential to the operation of the disclosed embodiments. For example, those skilled in the art of the disclosed embodiments will be able to make and use the teachings of this disclosure by simply employing the elements of the independent claims. Therefore, the embodiments of this disclosure set forth herein are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit and scope of this disclosure.

[0099] In this document, the term "comprise / comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but may also include other elements not expressly listed or inherent to the process, method, article, or apparatus. An element beginning with "a / an" or the like (without further constraints) does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the term "another" is defined as at least one second or more. As used herein, the terms "comprising," "having," and the like are defined as "including."

Claims

1. A method performed by a base station, comprising: Receive a radio link failure (RLF) report for a first sidelink communication between a first user equipment (UE) and a second UE, wherein the first sidelink communication is performed on at least one carrier and configured for at least one vehicle-to-everything (V2X) service, and wherein the RLF report contains at least one of the sidelink connection identifier ID of the first sidelink communication, the ID of the first UE, or the ID of the second UE. and Release the sidelink radio resource configuration corresponding to the first sidelink communication or the service associated with the first sidelink communication, or transmit information indicating the release of the radio resource configuration corresponding to the first sidelink communication.

2. The method of claim 1, wherein the sidelink radio resource configuration includes radio configuration or unicast connection.

3. The method of claim 1, wherein the RLF report includes at least one of the following: The sidelink connection identifier ID of the first sidelink communication, the ID of the first UE, or the ID of the second UE.

4. The method of claim 1, wherein the RLF report includes information indicating that all of the carriers having the same sidelink connection ID for the plurality of carriers used for the first sidelink communication have failed.

5. The method of claim 1, wherein the RLF report includes information indicating that all of the carriers having the same V2X service ID for the plurality of carriers used for the first sidelink communication have failed.

6. The method of claim 1, wherein the RLF report includes information indicating that one of the plurality of carriers having a sidelink connection ID for the first sidelink communication has failed.

7. The method of claim 1, further comprising: The first UE and the second UE release the sidelink radio resource configuration when they are within the coverage area of ​​the base station.

8. The method of claim 1, further comprising: When the first UE and the second UE are within the coverage area of ​​the base station, they transmit information indicating the release of radio resource configuration.

9. A method performed by a first user equipment (UE), comprising: Detecting a radio link failure (RLF) in a first sidelink communication between the first UE and the second UE, wherein the first sidelink communication is performed on at least one carrier and configured for at least one vehicle-to-everything (V2X) service; and Transmit an RLF report to the base station, or release a sidelink radio resource configuration corresponding to or associated with the first sidelink communication, wherein the RLF report contains at least one of the sidelink connection identifier ID of the first sidelink communication, the ID of the first UE, or the ID of the second UE.

10. The method of claim 9, wherein the sidelink radio resource configuration includes radio configuration or unicast connection.

11. The method of claim 9, wherein the RLF report further comprises at least one of the following: The sidelink connection identifier ID of the first sidelink communication, the ID of the first UE, or the ID of the second UE.

12. The method of claim 9, wherein the RLF of the first sidelink communication is determined by the first UE after all carriers having the same sidelink connection ID for the first sidelink communication have failed.

13. The method of claim 9, wherein the RLF of the first sidelink communication is determined by the first UE after all carriers having the same V2X service ID for the first sidelink communication have failed.

14. The method of claim 9, wherein the first UE determines the RLF of the first sidelink communication after a failure occurs in one of the plurality of carriers having the same sidelink connection ID for the first sidelink communication.

15. The method of claim 9, wherein the RLF report includes information indicating that all of the carriers having the same sidelink connection ID for the plurality of carriers used for the first sidelink communication have failed.

16. The method of claim 9, wherein the RLF report includes information indicating that all of the carriers having the same V2X service ID for the plurality of carriers used for the first sidelink communication have failed.

17. The method of claim 9, wherein the RLF report includes information indicating that one of the plurality of carriers having a sidelink connection ID for the first sidelink communication has failed.

18. The method of claim 9, further comprising: When the first UE and the second UE are outside the coverage area of ​​the base station, the RLF report is transmitted to the upper layer of the first UE, and optionally the upper layer includes the NAS layer, the V2X layer or the application layer.

19. The method of claim 18, further comprising: The upper layer releases the sidelink radio resource configuration.

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